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Exercise 1.1: Choose the best word or phrase to fill in the blank.

Question 1: All students______wear uniforms at school because it is a rule.

A. should                     B. have to                    C. ought to                  D. must

Question 2: You______finish your homework before you go to bed.

A. must                        B. have to                    C. should                     D. ought to

Question 3: This drink isn't beneficial for health. You______drink it too much.

A. should                     B. ought to not            C. ought not to            D. mustn't

Question 4: This warning sign indicates that you______step on the grass.

A. shouldn't                B. mustn't                    C. don't have to           D. ought not to

Question 5: I think you______do exercise regularly in order to keep your body in good shape.

A. must                        B. should                     C. ought to                  D. Both B and C

Question 6: I will lend you some money, but you______pay it back to me next week.

A. should                     B. have to                    C. must                        D. mustn't

Question 7: Hoa______feed the cats because her mother has done it already.

A. has to                      B. doesn't have to       C. must                        D. Both A and C

Question 8: Those audiences______show their tickets before entering the concert hall.

A. have to                    B. must                        C. ought to                  D. don't have to

Question 9: The children______spend too much time playing computer games.

A. mustn't                    B. ought to not            C. shouldn't                 D. Both B and C

Question 10: In case you're suffered from the injury, you______see the doctor today.

A. had better               B. must                        C. ought                       D. have better

Question 11: Water park is free for kids under 6 years old, so you______pay money for your son.

A. have to                    B. mustn't                    C. can't                         D. don't have to

Question 12: You look totally exhausted. You______take a rest instead of working overtime.

A. should                     B. ought                       C. must                        D. has better

Question 13: Anyone______have a passport, even a visa when travelling all around the world.

A. ought to                  B. must                        C. should                     D. has to

Question 14: In the peak season, travellers______book their accommodation in advance.

A. have to                    B. must                        C. should                     D. ought

Question 15: My car broke down yesterday, so I______catch a taxi to the office.

A. have to                    B. had better               C. had to                      D. has to

Question 16: We______eat as much fruit as possible in order to get enough vitamins for our bodies.

A. had better               B. should                     C. ought to                  D. All are correct

Question 17: You______tell anyone what I've revealed to you. It's still a secret.